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Scroll columns area to right when children property is changed (#4517)

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The feature to pin column could hide the rightmost column, which is
specified with children property of ColumnsArea.

The user is likely to see the column when the property changed, so scroll
the area in such cases.
This commit is contained in:
Akihiko Odaki 2017-08-05 01:57:46 +09:00 • committed by Eugen Rochko
parent 400616813e
commit 9d1f8b9d6a
4 changed files with 20 additions and 9 deletions
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11
app/javascript/mastodon/scroll.js
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@ -1,9 +1,9 @@
const easingOutQuint = (x, t, b, c, d) => c * ((t = t / d - 1) * t * t * t * t + 1) + b;
const scrollTop = (node) => {
const scroll = (node, key, target) => {
const startTime = Date.now();
const offset = node.scrollTop;
const targetY = -offset;
const offset = node[key];
const gap = target - offset;
const duration = 1000;
let interrupt = false;
@ -15,7 +15,7 @@ const scrollTop = (node) => {
return;
}
node.scrollTop = easingOutQuint(0, elapsed, offset, targetY, duration);
node[key] = easingOutQuint(0, elapsed, offset, gap, duration);
requestAnimationFrame(step);
};
@ -26,4 +26,5 @@ const scrollTop = (node) => {
};
};
export default scrollTop;
export const scrollRight = (node) => scroll(node, 'scrollLeft', node.scrollWidth);
export const scrollTop = (node) => scroll(node, 'scrollTop', 0);